HomeExhaust > MufflersWalker 21399 Exhaust Muffler
Part #: 21399

Walker 21399 Exhaust Muffler

Quiet-Flow SS
22 vehicles fit this part
Select your vehicle to confirm fitment
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OE Direct Replacement — Bolt-on fit, no modifications needed
Quiet-Flow SS
Fitment: Chevrolet, Impala and Monte Carlo
Easy Returns — Return within 60 days for a full refund
Fast Shipping — Most orders ship same business day before 1pm CST

Overview of Walker Quiet-Flow SS Exhaust Muffler 21399

The Walker Quiet-Flow SS Exhaust Muffler 21399 is designed specifically for Chevrolet Impala and Monte Carlo models. Engineered with durable stainless steel and an aluminized finish, this muffler offers reliable performance and corrosion resistance for your vehicle's exhaust system.

  • Inlet outside diameter: 2.25 inches
  • Outlet outside diameter: 2.5 inches
  • Oval-shaped muffler body with 11-inch width and 5.5-inch height
  • Overall length of 29 inches with a 15-inch body length
  • Single inlet and outlet with offset inlet configuration
  • Constructed from stainless steel with aluminized finish for durability
  • Specific fit for Chevrolet Impala and Monte Carlo
  • Combination muffler type with center outlet tip

Detailed Product Description

The Walker Quiet-Flow SS 21399 exhaust muffler features a combination muffler design that balances sound reduction and exhaust flow efficiency. Its oval shape and precise dimensions, including an 11-inch body width and 5.5-inch height, allow for a tailored fit in the exhaust system of Chevrolet Impala and Monte Carlo vehicles. The muffler includes a 2.25-inch offset pipe connection inlet and a 2.5-inch center outlet tip, ensuring compatibility with the factory exhaust layout. The stainless steel body with an aluminized finish provides resistance to rust and corrosion, extending the service life of the muffler under typical driving conditions.

Walker Quiet-Flow SS Product Line Features

The Quiet-Flow SS line by Walker is known for its stainless steel construction and aluminized finish, designed to offer a balance of durability and noise reduction. This product line focuses on providing specific fit mufflers that meet OEM specifications for various vehicle models, including Chevrolet Impala and Monte Carlo. The 21399 muffler exemplifies the Quiet-Flow SS commitment to quality materials and precise fitment.

Common Applications and Problem Solving

  • Replacement for worn or damaged mufflers on Chevrolet Impala and Monte Carlo
  • Reduction of excessive exhaust noise and vibration
  • Restoration of proper exhaust flow and backpressure
  • Prevention of rust and corrosion-related exhaust leaks
  • Improvement of overall exhaust system durability

Installation Notes and Tips

This muffler is designed for specific fitment on Chevrolet Impala and Monte Carlo models, ensuring a direct replacement without modification. The offset inlet and center outlet tip require alignment with existing exhaust piping. Professional installation is recommended to ensure proper sealing and secure mounting. Verify inlet and outlet diameters (2.25 inches inlet, 2.5 inches outlet) match your vehicle’s exhaust system before installation.

Quality Assurance and Warranty

Walker manufactures the Quiet-Flow SS 21399 muffler with high-grade stainless steel and aluminized finish to resist corrosion and wear. While specific warranty details are not provided here, Walker products typically meet or exceed OEM standards for durability and performance. For warranty information, consult the manufacturer or authorized distributor.

BrandWalker
Part Number21399
PositionQuiet-Flow SS
Inlet Outside Diameter2.25
Outlet Outside Diameter2.5
Universal Or Specific FitSpecific
ShapeOval
Grade TypeRegular
Body Width11
Inlet Quantity1
Outlet Quantity1
ReversibleNo
TunableNo
Overall Length29
Body Height5.5
Body Length15
Body MaterialStainless steel
FinishAluminized
Inlet 1 Outside Diameter2.25
Inlet 1 TypePipe connection
Inlet ConfigurationOffset
Inlet Offset3.75
Inlet TypePipe connection
Muffler TypeCombination
Outlet 1 Outside Diameter2.5
Outlet 1 TypeTip
Outlet ConfigurationCenter
Outlet TypeTip

This part fits 22 vehicles. Search below:

YearMakeModelSubmodelLitersCylindersPositionNotes
2005ChevroletImpala3.4LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2005ChevroletImpalaBase3.8LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2005ChevroletImpalaSS3.8LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2005ChevroletImpalaLS3.8LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2005ChevroletMonte Carlo3.4LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2004ChevroletImpala3.4LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2004ChevroletImpalaBase3.8LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2004ChevroletImpalaSS3.8LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2004ChevroletImpalaLS3.8LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2004ChevroletMonte Carlo3.4LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2003ChevroletImpala3.8LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2003ChevroletImpala3.4LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2003ChevroletMonte Carlo3.4LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2002ChevroletImpala3.8LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2002ChevroletImpala3.4LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2002ChevroletMonte Carlo3.4LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2001ChevroletImpala3.8LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2001ChevroletImpala3.4LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2001ChevroletMonte Carlo3.4LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2000ChevroletImpala3.8LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2000ChevroletImpala3.4LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2000ChevroletMonte Carlo3.4LV6N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

2310

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.